Wow... that's really a tough question. I can say, "I'm not this
mug of coffee next to me" yet I'm drinking from it, so its
contents become a part of me quite literally and so, the coffee
becomes me (part of), so I can say the coffee is/will be me in a
sense. Also, when I pick up the mug, my brain incorporates the
mug into my body, considering it as part of me. [Heidegger was
correct 80 years ago: the tool really DOES become you]. So, I
can say the mug of coffee next to me *is* me in a sense: I can't
say it's NEVER me because sometimes it is. Tougher question than
I would've expected.